Passover Sunshine Cake

In large bowl, beat together egg yolks, half of the sugar, the matzo cake meal, potato flour, orange rind and juice and vanillin sugar until blended. Set aside.

In separate large bowl and with clean beaters, beat egg whites with salt until soft peaks form. Beat in remaining sugar, 2 tbsp (25 mL) at a time, until stiff peaks form.

With spatula, gently fold one-third of the egg whites into yolk mixture; fold in remaining whites just until no streaks remain. Scrape into ungreased (not nonstick) 10-inch (4 L) tube pan; smooth top. Bake in centre of 350°F (180°C) oven until top springs back when lightly touched, about 50 minutes.

Turn pan upside down and let cake hang on legs attached to pan or on inverted funnel, or bottle, until cooled, about 3 hours. Run long palate knife around centre and side of pan, pressing blade against pan and reaching to bottom to loosen cake. Unmould onto cake plate. (Make-ahead: Cover with plastic wrap; store for up to 24 hours.)

Citrus Curd: In saucepan, whisk eggs, sugar, orange rind, orange and lemon juices and potato flour. Bring to boil over medium-high heat and boil, stirring, for 1 minute. Remove from heat; whisk in margarine. Strain through fine sieve into bowl. Place plastic wrap directly on surface; refrigerate until cold, about 2 hours. (Make-ahead: Refrigerate for up to 2 days.) Spread 1/3 cup (75 mL) over top of cake; top with strawberries, raspberries and mango. Serve with remaining curd.